XML Catalog
An XML Catalog maps a system ID or a URI reference for a resource
(stored either remotely or locally) to a local copy of the same resource. Whenever XML
processing relies on external resources (such as referenced schemas and stylesheets), the use of
an XML Catalog becomes a necessity when Internet access is not available or the
connection is slow.
Oxygen XML Editor includes default global catalogs as well as default catalogs for each of the built-in frameworks, and you can also create your own. Oxygen XML Editor uses these XML Catalogs to resolve references for document validation and transformations. For more information, see Working with XML Catalogs.